Physical and mechanical characterization of paricá LVL panels (Schizolobium parahyba var. amazonicum (Huber x Ducke)) glued with urea-formaldehyde

ABSTRACT

The objective of this work was to determine the physical and mechanical properties of paricá (Schizolobium parahyba var. amazonicum (Huber x Ducke)) LVL panels bonded with urea-formaldehyde resin. Six LVL panels were produced with 17 sheets of 2.5 mm thick, 14 sheets of paricá and 3 sheets of marupá (Simarouba amara Aubl.). For the standard temperature condition of 12%, tests were carried out on moisture content, apparent and basic densities (physical characterization), resistance to resistance parallel and perpendicular to the fibers, traction parallel to the fibers, shearing in the glue line and flatwise static bending and edgewise (mechanical characterization). In addition, saturation tests parallel to the fibers and shear tests were carried out in the LVL glue line in the condition of total saturation of the wood. The results appreciated that the LVL panels fall within the D30 strength class and medium density. The brittle type failure mode was observed in all mechanical tests, except in the parallel and perpendicular compression tests to the fibers. The increase in moisture content, due to the total saturation of the wood, negatively influences the resistance to the slope parallel to the fibers and to the shear strength in the glue line. The LVL presented a mechanical performance compatible with the substitute.

Keywords
Wood; LVL; Paricá; Physical characterization; Mechanical characterization